Which data format should you use?: The choice......is yours!
Look, I'd rather be climbing a mountain than messing with a bunch of weird data formats. I use plain text for everything.
should you use?
We have a lot of very wellrespected clients, and they care about speed and standards, not the latest fad. We use text for our requests, and XML for responses from our servers.
I'm all about the new stuff, baby. I was the first guy in the office to use Ajax, and I use JSON for everything. Plain text is boring, and XML is so 1998.